3Com VCX V7122 SIP VoIP Gateway User Manual 163C HAPTER 9: D IAGNOSTICSSeveral diagnostic tools are provided, enabling you to identify correct functioning of the VCXV7122, or an error condition with a probable cause and a solution or workaround. Front panel indicator LEDs on the VCX V7122. The location and functionality of the frontpanel LEDs is shown in TP-1610 Front Panel LED Indicators on page 22. VCX V7122 Self-Testing on hardware initialization (see VCX V7122 Self-Testing below). Syslog Event Notification Messages (see Syslog Support below).VCX V7122 Self-TestingThe VCX V7122 features two self-testing modes: rapid and detailed.Rapid self-test mode is invoked each time the media gateway completes the initializationprocess. In this short test phase the only error detected and reported is failure in initializinghardware components. All Status and Error reports in this self-test phase are reportedthrough Network Interface ports, as well as indicated by the LED Status Indicators.Detailed self-test mode is invoked when initialization of the media gateway is completedand if the configuration parameter EnableDiagnostics is set to 1 (this parameter can beconfigured through the ini file mechanism). In this mode, the media gateway tests all thehardware components (memory, DSP, etc.), outputs the status of the test results, and endsthe test. To continue operational running, reset the media gateway again but this timeconfigure the EnableDiagnostics parameter to 0.Syslog SupportSyslog protocol is an event notification protocol that enables a machine to send eventnotification messages across IP networks to event message collectors, also known asSyslog servers. Syslog protocol is defined in the IETF RFC 3164 standard.Since each process, application and operating system was written independently, there islittle uniformity to Syslog messages. For this reason, no assumption is made on the contentsof the messages other than the minimum requirements of its priority.Syslog uses UDP as its underlying transport layer mechanism. The UDP port that wasassigned to Syslog is 514.The Syslog message is transmitted as an ASCII (American Standard Code for InformationInterchange) message. The message starts with a leading "<" (less-than character), followedby a number, which is followed by a ">" (greater-than character). This is optionally followedby a single ASCII space.The number described above is known as the Priority and represents both the Facility andSeverity as described below. The Priority number consists of one, two, or three decimalintegers.
